Efficient high-repetition-rate fs-laser based X-ray source

Kutzner, J.; Silies, Martin; Witting, Tobias; Tsilimis, G.; Zacharias, H.

doi:10.1007/s00340-004-1435-4

Cited by 19 publications

(14 citation statements)

References 28 publications

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“…However, the prepulse enhancement in vacuum was reported to be higher and to have a peak in the function of the pulse separation time in the range of 30-50 ps. [12,27] This result can be also explained with collision of diatomic molecules. In vacuum conditions, electrons generated by preplasma can expand from a few to several micrometers from the target surface because of the electron mean free path of below 1 mm to 100 mm.…”

Section: Wμmmentioning

confidence: 63%

“…In a vacuum, the Kα X-ray intensity with prepulse enhancement has been reported to be three to ten times higher than with the main pulse only. [12,27] The prepulse enhancement effect of Kα X-ray intensity in a helium atmosphere was smaller than that in a vacuum. At plasma intensity of 3.0 × 10 16 Wμm 2 /cm 2 in helium at atmospheric pressure, the X-ray intensity with prepulse in helium was almost constant for any separation time during 1-50 ps.…”

Section: Wμmmentioning

confidence: 92%

“…[12,[24][25][26][27] The mechanism of X-ray intensity enhancement with prepulse is explained by the strong interaction between electrons in the preplasma and the main laser pulse. The prepulse produces weak plasma on the surface of the target and electrons in the plasma are gradually expand from the surface within a distance of more than a few micrometers in the time scale of 10-100 ps.…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that the X-ray intensity with prepulse enhancement is three to ten times higher than with only a main pulse, and the time separation between prepulse and main pulse is on the order of 10-100 ps. [12,27] Regarding prepulse, there is an advantage and disadvantage; the advantage is improving the X-ray yield and the disadvantage is the extension of the X-ray pulse duration. The electrons in plasma can expand from the surface to distance of more than 30 μm even in low vacuum pressure of 10 torr.…”

Section: Introductionmentioning

confidence: 99%

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Development of femtosecond X-ray source in helium atmosphere with millijoule high-repetition-rate femtosecond laser

Hada

Matsuo

2009

Trans. Mat. Res. Soc. Japan

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High intensity Cu Kα X-ray was generated in helium at atmospheric pressure (760 torr) using a commercial millijoule high-repetition rate Ti: sapphire laser. The characteristic Kα X-ray was generated by focusing the 0.06 mJ-1.46 mJ, 100 fs and 1 kHz repetition femtosecond laser onto a solid Cu target to a spot with a 5 μm diameter. We obtained the characteristic Kα X-ray of 5.4 × 10 9 photos/s into 2π sr at a 1 kHz repetition rate with 5.0 × 10 -6 conversion efficiency. Kα X-ray intensity can be enhanced with 4-8% prepulse plasma into 7.7 × 10 9 photos/s/sr with 6.8 × 10 -6 conversion efficiency. The X-ray intensity and conversion efficiency in helium achieved the almost the same level as in vacuum. Such vacuum-free femtosecond X-ray source with a tabletop laser can be a promising and easy accessible tool for time-resolved X-ray diffraction and other radiographic applications. The time-resolved X-ray diffraction experiment would reveal the ultrafast dynamics in crystalline materials, such as coherent phonon vibrations and ultrafast phase transitions.

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Section: Wμmmentioning

confidence: 63%

Section: Wμmmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development of femtosecond X-ray source in helium atmosphere with millijoule high-repetition-rate femtosecond laser

Hada

Matsuo

2009

Trans. Mat. Res. Soc. Japan

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“…The energy efficiency for converting the fundamental laser radiation into X radiation reaches values 19 of Á D 10 5 . For comparison, on solid metal targets similar conversion efficiencies are achieved at substantially higher laser intensities in the 10 17 W/cm 2 range.…”

Section: Introductionmentioning

confidence: 99%

Laser‐based, high repetition rate, ultrafast X‐ray source

Kutzner

Witte

Silies

et al. 2006

Surface & Interface Analysis

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A compact, ultrashort, laser-based hard X-ray source particularly suited for high repetition rate laser systems (≥1 kHz) is presented. X rays in the keV energy range are generated efficiently with 30 fs laser pulses on different tape targets containing chromium and iron. Spectroscopic investigations showed that for the chromium as well as for the iron tapes, strong Ka and Kb emission were observed in addition to a weak bremsstrahlung continuum. These tape targets are especially suited for applications in a transmission geometry, which provides significant advantages. The operation of the tape target was studied with repetition rates up to 10 kHz. With input pulses of 0.5 mJ and modest intensities in the low 10 15 W/cm 2 range, X-ray Ka photon fluxes exceeding 6 × 10 9 photons/s were achieved, yielding conversion efficiencies of h Ka > 10 −6 . With a toroidally bent crystal the generated radiation was monochromatized and focused to a 85-µm diameter spot demonstrating the ability of the source to act as a X-ray point source, a pre-requisite for an application in X-ray microscopy.

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Noll¹

2011

Laser-Induced Breakdown Spectroscopy

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Efficient high-repetition-rate fs-laser based X-ray source

Cited by 19 publications

References 28 publications

Development of femtosecond X-ray source in helium atmosphere with millijoule high-repetition-rate femtosecond laser

Development of femtosecond X-ray source in helium atmosphere with millijoule high-repetition-rate femtosecond laser

Laser‐based, high repetition rate, ultrafast X‐ray source

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